With great trepidation I defrosted a black and white rat. Having tried him on one before and finding it untouched in the morning I didn't hold out much hope. So, tried to get him to strike with no joy. He was interested but was looking at it as if to say "WTF is that!". The dissection kit came out and amateur brain surgery commenced, put the rat with more holes than it started out with on top of his hot hide and left them both to it. In the morning it was gone .
Hopefully he has got over his ratty rascism now and will bite and crush the life out of any rodent regardless of their colour, creed, religious beliefs, etc